Lots of GM parts bin shopping on the Series One. If I recall the gauge cluster was from the F body. I want to say the shifter was also F body. Not sure on the steering column since it was a non air bag car.

Gary & Gary were around back then but are probably too busy to put together a list but if you emailed one of them with a couple of parts questions I'm sure they could help.

You can always attend the Vegas Bash in January and drag one of the Gary's into the Shelby Museum for a rundown